Resolving dependencies...
Starting     validity-0.11.0.0
Starting     splitmix-0.1.0.3
Building     validity-0.11.0.0
Building     splitmix-0.1.0.3
Completed    validity-0.11.0.0
Completed    splitmix-0.1.0.3
Starting     random-1.2.0
Building     random-1.2.0
Completed    random-1.2.0
Starting     QuickCheck-2.14.2
Building     QuickCheck-2.14.2
Completed    QuickCheck-2.14.2
Starting     genvalidity-0.11.0.2
Building     genvalidity-0.11.0.2
Failed to install genvalidity-0.11.0.2
Build log ( /home/builder/.cabal/logs/ghc-8.10.2/genvalidity-0.11.0.2-A0Q8wOywcweKBrFJuvfYje.log ):
cabal: Entering directory '/tmp/cabal-tmp-8963/genvalidity-0.11.0.2'
Configuring genvalidity-0.11.0.2...
Preprocessing library for genvalidity-0.11.0.2..
Building library for genvalidity-0.11.0.2..
[1 of 4] Compiling Data.GenValidity.Utils ( src/Data/GenValidity/Utils.hs, dist/build/Data/GenValidity/Utils.o, dist/build/Data/GenValidity/Utils.dyn_o )
[2 of 4] Compiling Data.GenValidity ( src/Data/GenValidity.hs, dist/build/Data/GenValidity.o, dist/build/Data/GenValidity.dyn_o )

src/Data/GenValidity.hs:652:50: error:
    " Variable not in scope: isLineSeparator :: Char -> Bool
    " Perhaps you meant genLineSeparator (line 649)
    |
652 | genNonLineSeparator = genValid `suchThat` (not . isLineSeparator)
    |                                                  ^^^^^^^^^^^^^^^
cabal: Leaving directory '/tmp/cabal-tmp-8963/genvalidity-0.11.0.2'
cabal: Error: some packages failed to install:
genvalidity-0.11.0.2-A0Q8wOywcweKBrFJuvfYje failed during the building phase.
The exception was:
ExitFailure 1